refactor: move Pkl module definitions to dedicated package

pkg/dwn/gen/Schema.pkl.go

@@ -0,0 +1,22 @@
+// Code generated from Pkl module `dwngen`. DO NOT EDIT.
+package gen
+
+type Schema struct {
+	Version int `pkl:"version"`
+
+	Account string `pkl:"account" json:"account,omitempty"`
+
+	Asset string `pkl:"asset" json:"asset,omitempty"`
+
+	Chain string `pkl:"chain" json:"chain,omitempty"`
+
+	Credential string `pkl:"credential" json:"credential,omitempty"`
+
+	Jwk string `pkl:"jwk" json:"jwk,omitempty"`
+
+	Grant string `pkl:"grant" json:"grant,omitempty"`
+
+	Keyshare string `pkl:"keyshare" json:"keyshare,omitempty"`
+
+	Profile string `pkl:"profile" json:"profile,omitempty"`
+}